Heater



FIG. 1 is a top perspective view of the heater;

FIG. 2 is a front elevational view of the heater of FIG. 1;

FIG. 3 is a rear elevational view of the heater of FIG. 1;

FIG. 4 is a left elevational view of the heater of FIG. 1;

FIG. 5 is a right elevational view of the heater of FIG. 1;

FIG. 6 is a top plan view of the heater of FIG. 1; and,

FIG. 7 is a bottom plan view of the heater of FIG. 1.

The broken line drawings in FIGS. 1, 2, 3, 6 and 7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a heater, as shown and described. 